Need Help with Mechanical Principles: Calculating Stress, Strain, and Extension

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The discussion focuses on calculating mechanical principles related to stress, strain, and extension for a steel bar subjected to a tensile force. Key equations include tensile stress (σ = F/A), tensile strain (ε = ΔL/L), and the relationship between stress, strain, and modulus of elasticity (E = σ/ε). Participants provide guidance on how to calculate tensile stress, strain, and extension using the given parameters of the steel bar. Understanding these concepts is crucial for solving the problem effectively. The thread emphasizes the importance of grasping the fundamental relationships between stress, strain, and material properties.
Curly91
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Hey guys. Just signed up hear after finding the website. I really need some help on Mechanical Principles as i have just been handed work to do once i came back from my car crash. I don't have a clue what any of it means so i could really do with your help.

One of the questions is: A steel bar of 70mm dia is subjected to a pull of 120kN. If E=200GN/m2 and the length is 400mm, calculate:
a) the tensile stress
b) the tensile straing
c) the extension

Any help at all would be appreciated.
 
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Can you write down any of the relevant equations? How does stress relate to strain and modulus (E)? If you know strain, and the total length, how would you find extension?
 
Thread 'Have I solved this structural engineering equation correctly?'

Thread 'Have I solved this structural engineering equation correctly?'

Hi all, I have a structural engineering book from 1979. I am trying to follow it as best as I can. I have come to a formula that calculates the rotations in radians at the rigid joint that requires an iterative procedure. This equation comes in the form of: $$ x_i = \frac {Q_ih_i + Q_{i+1}h_{i+1}}{4K} + \frac {C}{K}x_{i-1} + \frac {C}{K}x_{i+1} $$ Where: ## Q ## is the horizontal storey shear ## h ## is the storey height ## K = (6G_i + C_i + C_{i+1}) ## ## G = \frac {I_g}{h} ## ## C...
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